密度级 meaning in Chinese
density class
density level
density step
Examples
- A sorting method of the helicopter noise sources is given . the temporal waveform and spectrum of the noise signature is analyzed . at last , the sound pressure spectrum density level is estimated with the experimental data taken from a specific navy helicopter
扼要阐述了直升机噪声的产生和分类，考察了直升机信号的波形和频谱特征，并对特定的直升机噪声的声压谱密度级进行了计算。